The problem of setting availability targets for ITER diagnostics: problem statement and solution algorithm

The problem of setting availability targets for diagnostic systems (diagnostics) in the ITER project is studied. Such systems must provide the required level of availability, with which numerous parameters of ITER are measured. There are a number of difficulties on the way of problem statement and its solution. These are, in particular, the uniqueness of the object, the diversity and plurality of parameters and diagnostics, the complex interrelation between them, and the absence of analogues in the literature on reliability. The article describes a mathematical model of measurement reliability which takes into account both strict limitations and vaguely expressed wishes of developers. An effective algorithm for calculating diagnostic availability targets is developed. The illustration example of calculation was prepared with the help of a specially created software which uses along with the developed algorithm the possibility of volitional decision-making.